blindfold and handcuffs -- >> you want to think, it's got to be sexual, right. >> you would think. >> yeah. it's a good point. i wouldn't be afraid to say it was sexual. the truth is, it wasn't. >> kind of an odd diversion for two academics. the wife, sheila davalloo, was a research scientist, her husband, paul christos, was pursuing his doctorate in epidemiology. >> she said she just wants to play this game. it will take a couple hours. she'll be happy and i'll go back to my work. >> paul says sheila went first. she was handcuffed to a chair. paul put a few items against her face, a camera, a shampoo bottle. she tried to guess what they were. and then it was paul's turn. blindfolded, handcuffed, the whole drill. how long did it take until this game took a very bizarre, painful, dangerous turn? >> i would say after five or six items, i felt a large, or heavy thrust on my chest.